Means for securing antifriction pads to leaf springs



June 9, 1931. SCHUPP 1,808,822

MEANS FOR SECURING ANTIFRIGTION P ADS TO LEAF SPRINGS Filed Dec'. 5, 1928 INVENTOR A/PU/P A SCHUPP A TTORNEY Patented June 9, 1931 UNITED STATES PATENT OFFICE '1 ARTHUR A. SCHUIP, OF SAGINAW, MICHIGAN, ASSIGNOR T FBEDERICKSEN COMPANY,

. it as heretofore; and the hole in the sprin OF SAGINAW, MICHIGAN, A,

CQRPORATION OF MICHIGAN.

IEANS r03. smonme mrmmcmron ram '10 LEAF 'srnmes Application filed December 5, 1928. Serial No. 323,886.

This invention relates to leaf springs of the kind whose overlapping leaves are separated near their free ends by intervening pads of anti-friction material, for example, plates or disks or cast bronze or other suitable metal for rendering the springs easier working and for preventing wear and noise when the springs are in use.

My invention is found in a novel mode of attaching the anti-friction pad to the spring leaf.

The objects of the improvement are to re"- duce the cost of manufacture by employin a flat disk pad having an aperture instea of one formed with a projecting stem member as heretofore; to avoid maklng an aperture in the'spring leaf, thereby weakening strengthen the leaf by strikin or pressing up a part of its face to form a oss that acts as an anchorage for securing the disk to the spring, the striking up operation being no more costly than the usual hole punching operation.

Another object is to provide a boss having sharp peripheral edges and being slightly lar er than the hole in the disk so that the dis when forced onto the boss, will have the walls of its bore scraped by and hence accurately fitted to the boss. Moreover, metal scrapings produced by that operation collect at the face .of the boss and consequently can not become packed between the spring and the disk to prevent proper seating of the disk, as often occurs when the, projecting stem of a soft metal disk is forced into a leaf, a mode of fastening which has hereto ore been employed.

With the foregoing and certa n other objects in view, which will appear later in the specification, my invention comprises the devices described and claimed and the? equivalents thereof.

In the drawin s Fig. 1 is a side view of a leaf spring to w ich my invention is adapted to be applied.

Fig. 2 is an enlarged view, partly in section, showing the boss and disk detached.

Fig. 3 is a similar view assembled.

The leaf spring may be of any appropriate type, usually a plurality of overlapping leaves 1, 2, spaced apart near their ends by intervening pads 3 of anti-friction metal. In applying my invention to a pad-andspring construction: of this kind I provide a boss 4, shownin Figs; 2 and 3, pro'ecting a short distance outwardly from a face of the spring leaf, say, about three sixtyfourths inch.

The other face of boss, is formed with a shallow depression 8, made dish-like with gradually sloping edges, indicated by dotted lines in Fig. 2, in order that the back of a leaf shall present no sunken places in which ce'nt spring might possibly catch and thereby hamper the free sliding movement of the leaves one upon another.

The boss 4 is preferably cylindric in shape, but may be square, polygonal or of any other desired contour. It is preferably formed by striking up,the material ofthe spring over an area, say, one half inch diameter, while forcing the material so displaced into a suitable forming die that imparts to the boss straight walls 5, that is to say, walls that possess substantially sharp peripheral edges- The aperture 3a may extend clear through the pad 3, or only part way through it, but in any event the depth of the aperture and the thickness of the pad are both greater than the thickness of the boss 4 so the boss when in use can not contact with theface of.

an adjacent spring leaf.- Preferably the size of the aperture 3a is slightly less than the cross sectional size of the boss.

a projection on an adjathe leaf, opposite the erably is appropriately the shape, size and a In other l words, theboss is made slightly oversize for the aperture. The purpose of this is to keep the pads in place while assembling a number of leaves to form the complete spring structure.

When the pad is forced into place u on the boss it seats snugly against/the leaf Face while the over-sized boss with its sharply defined;edges 6 and parallel walls makes greater than the thickness of saidaobessfand fi'zzalplace-ifor. itself in the bore 3a and fits very the size .of the aperture normally slightly tightly therein, as in press-fit relation. less than the cross-sect1onal mm of the boss. A Any small metal particles 9 which the In testimony whereof, I aflix' my s1gna- 5 edges 6 of the boss shear from the walls of ture. 70

the aperture 3a remain in the aperture and RTH R A- SC PP- can not do any harm. I

Heretofore pads havebeen employed hav- .ing projecting-shanks driven into holes in g i a, 1a the I spring and difiiculty has been experi- V 75 enced because the metal scraped from the a stem necessarily lodged between the face of the' splring and the face of the pad, preventing t e pad from seating fairly against the 115 spring. The-arrangement herein described avoids that difiiculty by keeping the metal scrapings awa from the contacting faces of leaf 1 and pa 3.

In operation the anti-friction pad applied all in the manner described remains in place un- 85 I til its face is worn down to the end of the boss, after which it may be replaced. The aperture 31; forms also an oil pocket that aids in keeping the face of the pad lubricated during its back-andforth rubbing movement. I

Having thus described my invention, what I claimand desire to secure by Letters Patent isz' v so 1. In a leaf spring whose leaves are sep- 95 arated near their free ends by intervening pads of anti-friction material, means for astening a pad to a leaf com rising a boss struck from the material of t e spring and I 35 projectingfrom a face thereof, said boss disc-shaped with abrupt peripheral edges at I its disk face and likewise at the junction of the boss with the face of the spring, and a centrall apertured pad of anti-friction ma- 40 terial w ich is of-greater thickness than the 105 '85 ceiving said boss, the depth of said aperture boss and is received thereon in force-fitting relation thereto.

2. In a leaf spring whose leaves are separated near their free ends by intervening v v pads of anti-friction material, means for no fastening a pad to a spring comprising a boss projecting from a face. of the spring, I said boss formed with sharply defined peripheral edges at its outer face and likewise v at the junction of the boss with the face of 1 n5 the spring, and a pad of anti-friction ma- 1 terial of greater thickness than the boss apertured to receive said boss.

3. A leaf spring having a boss projecting outwardly from a face thereof and a sub-- stantially flat pad of anti-friction material of greater thickness than the boss and formedwith an aperture receiving said boss in ress-fit relation, for the purpose set 25 60 fort.

4, A spring leaf having aboss projecting outwardly from a face thereof, a pad of anti-friction material seated against said leaf face and formed with an apertureiem 

